CVE-2026-4359 PUBLISHED

Heap-buffer-over-read in _mongoc_http_send via strstr on non-null-terminated buffer

Assigner: mongodb
Reserved: 17.03.2026 Published: 17.03.2026 Updated: 17.03.2026

A compromised third party cloud server or man-in-the-middle attacker could send a malformed HTTP response and cause a crash in applications using the MongoDB C driver.

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS Score: 2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	High	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	Low	Availability	None
Privileges Required	High
User Interaction	Passive

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
CVSS Score: 2

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	None
Privileges Required	High	Integrity Impact	None
User Interaction	Required	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	MongoDB Inc
Product	MongoDB C Driver
Versions	Default: unaffected affected from 0 to 2.2.3 (excl.)

Credits

Halil Oktay (oblivionsage) finder

References

https://jira.mongodb.org/browse/CDRIVER-6251

Problem Types

CWE-158 Improper neutralization of null byte or NUL character CWE